package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @ClassName: ShoppingCartServiceImpl
 * @Package: com.sky.service.impl
 * @Author: 金磊
 * @CreateDate: 2025/4/16 - 17:41
 * @Version: V1.0.0
 * @Description:
 */
@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long currentUserId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentUserId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //判断购物车是否已存在该商品
        if (list != null &&list.size() > 0) {
            //如果存在,则数量+1
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //如果不存在,则添加到购物车,需要插入一条数据到购物车表中

            //判断本次添加到购物车的商品是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();

            if (dishId != null) {
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                //套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取当前登录用户的id
        Long currentUserId = BaseContext.getCurrentId();
        //根据用户id查询购物车数据
        ShoppingCart shoppingCart = ShoppingCart
                .builder()
                .userId(currentUserId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */

    @Override
    public void cleanShoppingCart() {
        //获取当前登录用户的id
        Long currentUserId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(currentUserId);
    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long currentUserId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentUserId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //判断购物车是否已存在该商品
        if (list != null && list.size() > 0) {
            //如果存在
            shoppingCart= list.get(0);
            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
